Elevator door lock



M m M n r R M M 2 m u u N 5 5V3 0 E R 3 m mz/ m T z w m 2 3w J L I A INSULATION AUGUST W BLEYLE BY @ww A. W. BLEYLE ELEVATOR DOOR LOCK Filed May 2, 1944 Sept. 30, 1947.

Patented Sept. 30, 1947 UNITED STATES PATENT OFFICE ELEVATOR DOOR LOCK August W. Bleyle, Palo Alto, Calif.

Application May 2, 1944, Serial No. 533,776

10 Claims. 1

This invention relates to elevator door locks and more particularly to combined mechanical latches and circuit control switches for electric elevators.

Among the objects of the invention is the provision of an automatic latch that is proof against tampering,

Another object is to so construct the latch that it is equally applicable to horizontally and vertically guided, and radially swinging doors, by a simple rearrangement of the cam trip,

A further object is the provision of a positively controlled gravitating catch, free from spring actuated pivotal members.

A further object is the combining of an automatic circuit making and breaking switch with and controlled by the mechanical operation of the door and latch.

Other objects and advantages will appear as the description proceeds.

In the specification and drawings the invention is disclosed in its preferred form. But it is to be understood that it is not limited to this form, because it may be embodied in modifications within the spirit of the invention as defined in the claims following the description.

In the one sheet of drawings:

Fig. 1 is a side elevation of latch and switch assembly, with the cover partially removed, and the Cam trip in the plane of the door and the latch in the closed condition.

Fig. 2 is a top view of the assembly indicating in interrupted lines the selective position of the latch tripping mechanism.

Fig. 3 is a detail in end elevation of the catch tripping cam assembly, showing the cam block in vertical section.

In detail the structure shown in Fig. 1, comprises the encircling case I, preferably of cast metal screwed to the door frame X and having the side covers 2, 3. These covers are attached to the opposite sides of the frame by screws, such as 4, 5, in alinement on the opposite sides of the frame, respectively. The front wall 6 of the frame is recessed vertically to guide the flat catch 1 freely slidable therein. This catch is enclosed by the edge wall 8 of the case I, having the catch opening 9, and the switch opening III therethrough.

The cam trip comprises the shaft II pivoted in the hollow block I2, fixed to the internal bracket I3 on the frame, by the screw I 4. The arm I5 is adjustably fixed on the shaft by the clamp screw I6. The dielectric roller I1 is adjusted in the path of the usual magnetically re- 2 tractable cam Y indicated in dotted lines and mounted on the elevator cage. This cam automatically moves outward against the roller IT as the cage stops at the fioor level.

The double acting latch cam I8, see Fig. 3, is fixed on the shaft II within the block I2. The cam yoke I9 clears the shaft II and rests upon the cam lugs I8, I8. This yoke has the stem 20 protruding through and guided in the top of the block l2. The opposed lugs of this cam are set about in line with the axis of the shaft I I to give the maximum lift of the yoke I9, with minimal rotation of the shaft.

The catch actuating the weighted pressure lever 2| is pivoted to the frame I at 22 and rests upon the pointed head of the stem 20. The front end of this lever has the lug 2| engaging within a cross slot in the top of the catch I. When the arm I5 is tripped by the cam Y on the cage it rotates the shaft II and cam I8, causing it to lift the lever 2| and the catch I. This releases the head of the tapered catch 23 fixed on the bracket plate 23', that is mounted on the front edge of the door Z,

The switch for opening and closing the circuit controlling the elevator cage, consists of the dielectric base 24 fixed to the frame I. The binding posts 25, 26, in the operating circuit, pass through the base 24 and have the contacts 25, 21 thereon. Th yielding blade 28 is yieldingly mounted on the insulator 29 fixed to the catch plate I. A wiping blade 30 bears against the contact 21. These blades 28, so contact the bus bar 3|, mounted upon the insulating block 32 on the door Z. This switch closes the circuit when the door is closed and opens it when the door is opened.

The width of the block I2 is equal to the depth of the case I, permitting it to be readjusted to function in the various positions illustrated in Fig. 2. The cover 2 has a hole opposite the axis of the shaft II. When covers I, 2, are reversed to the opposite sides of the case I, the shaft II can be extended as at B. Taken with Figs. 1, 2, this gives three possible positions, A, B, C of the shaft II, relative to the plane of the case, on either side of the door frame X. For swing doors the plane of the case is set perpendicular to the plane of the door frame, with the shaft projecting laterally as at A. For vertically sliding doors, as for large freight elevators, the case I is fixed to the top of the door frame, with the shaft II projecting as at G into the path of the retractable cam Y on the elevator cage. In this instance it will be necessary to substitute an expensive spring 2 Ir between the adjacent end of the case and the lever 2| as a substitute for the weight of the lever 2|, to normally force the latch 1 into locking position. The pressure of the spring being overcome by the cam action of the inclined nose 23' of the latch 23 when the door closes.

It is important to coordinate the latch, catch and switch so that the operating circuit is open until the catch 1 drops behind the latch 23, before the bus bar 3| contacts the blade 30.

This invention operates substantially as follows: Referring to Fig. 1, when the elevator cage reaches the selected door level and is stopped, by opening the circuit by the usual operators manual control or automatic elevator control switch, as the case may be, the retractable cam Y is automatically released, which acting through the roller I! in contact therewith, swings the arm l5. This rotates the shaft H and the cam l8 thereon, lifting the yoke IS, the lever 2| and the catch 1 and releasing the latch 23 so that the door may be opened.

Opening the door withdraws the bus bar 3| and opens the operating circuit so that the elevator cage cannot be moved until the door is again closed. The positive engagement of the sliding plate catch 1 with the latch 23, is proof against tampering. Some forms of pivoted spring actuated bell-crank catches can be jarred out of engagements by violently shaking the door. This danger is eliminated by the present invention.

The make and break switch 28-3l is insulated by sheets of dielectric material, such as 33, interposed between the contact members and the adjacent covers 2, 3 in accordance with the prevailing Underwriters Code.

Having fully described this invention and its mode of operation, what is claimed and desired to secure by Letters Patent is:

1. A door lock comprising an enclosing case; a shaft protruding from said case and having a cam thereon within said case; a catch slidable in said case and having a latch opening therethrough, a pressure lever pivoted within said case, engaging said catch and actuated by said cam and normally holding said catch in looking position; and a latch having an inclined nose engaging said latch opening and lifting said catch against the resistance of said lever.

2. A door lock comprising an enclosing case; a shaft protruding from said case and having a cam thereon within said case, said cam having lugs extending on opposite sides of said shaft below the axis thereof; a catch slidable in said case and having a latch opening therethrough; a pressure lever pivoted within said case, engaging said catch and actuated by said cam and normally holding said catch in looking position; and a latch having an inclined nose engaging said latch opening and lifting said catch against the resistance of said lever.

3. A door lock comprising an enclosing case; a shaft protruding from said case and having a cam thereon within said case, said cam having lugs extending on opposite sides of said shaft below the axis thereof; a catch slidable in said case; a pressure lever pivoted in said case and normally holding said catch in locking position; a yoke straddling said shaft, actuated by said cam lugs and engaging said lever to slide said catch when said shaft is rotated; and a latch adapted to open and engage said catch.

4. A door lock comprising an enclosing case having an internal bracket; a block adju-stably mounted on said bracket; a shaft rotatable in said block and protruding from said case; a cam on said shaft within said block; a catch slidable in said case; a pressure lever pivoted in said case and engaging said catch; a stem guided in said block between said cam and catch lever and sliding said catch when said shaft is rotated; and a latch adapted to open and engage said catch.

5. A door lock comprising an enclosing case with a shaft opening through one of its lateral walls; reversible side plates on the opposite sides of said case, one of said plates having a shaft hole therethrough; a block within said case and adjustable relative to said shaft hole; a shaft rotatable in said block and protruding through said hole selectively; a catch slidable in said case; a pressure lever pivoted in said case, engaging said catch and actuated by said shaft; and a latch adapted to slide into and engage said catch.

6. A door lock comprising an enclosing case, a block adjustably mounted in said case: a shaft pivoted in said block and protruding from said case and having a cam thereon within said block; a stem guided in said block and actuated by said cam; a pressure lever pivoted in said case and actuated by said stem; a catch slidably guided in said case and actuated by said lever and having an opening therethrough; and a latch adapted to displace said catch and enter the opening therein.

'7. A door lock comprising an enclosing case, a block mounted in said case; a shaft pivoted in said block and protruding from said case and having a cam thereon within said block; a stem guided in said block and actuated by said cam; a pressure lever pivoted in said case and actuated by said stem and having a lug thereon; a catch slidably guided in said case and pivotally engaging said lug and having an opening therethrough;

and a latch adapted to displace said catch and enter the opening therein.

8. A door lock comprising an enclosing case, a block rotatably adjustable in said case and having a stem guided therein substantially in line with the axis of said block; a shaft pivoted in said block and protruding from said case; a cam on said shaft actuating said stem; a pressure lever pivoted in said case and actuated by said stem; a catch slidably guided in said case and actuated by said lever; and a latch engaging said catch.

9. A door lock comprising an enclosing case mountable on a door frame; a block adjustably mounted in said case; a shaft pivoted in said block and protruding from said case and having a cam thereon within said block; a stem guided in said block and actuated by said cam; a pressure lever pivoted in said case and actuated by said stem; a catch slidably guided in said case and actuated by said lever; a latch on a door movable relative to said frame and engaging said catch; a dielectric base in said case having separated electric contacts thereon; an insulator on said door and projecting into said case and having a bus bar thereon and contacting one of said contacts on said base; and a yielding blade on an insulator on said catch in said case and contacting said bus bar and the other of said contacts and closing an electric circuit when said door is closed and latched.

10. A door lock comprising an enclosing case mountable on a door frame; a pressure lever pivoted in said case; a catch slidably guided in said case and actuated by said lever and having an insulator projecting therefrom; a shaft pivoted in and protruding from said case and actuating said lever; a latch mounted on a door movable relative to said frame and engaging said catch;

2,428,063 5 6 a base block in said case having separated electric REFERENCES CITED contacts thereon; a wiping blade mounted upon said base block and resting against one of said contacts; a. yielding blade mounted on said insu- The following references are of record in the file of this patent:

lator on the catch; an insulating block on said 5 UNITED STATES PATENTS door and having a bus bar thereon projecting Number Name t t r u h an penin in s i case and havin 425,707 Sorensen Apr, 15, 1390 make-and-break contact with said wiping blade 1,335,544 Werner Dec, 3, 1931 and yielding blade respectively, when said door 2,196,477 Simpson Apr. 9, 1940 closes or opens. 10 783,731 Otis et al Feb. 28, 1905 1,155,870 Barlow Oct. 5, 1915 AUGUST W. BLEYLE. 1,836,452 Day Dec. 15, 1931 

